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Get free trial download avast cleanup for mac os. Core Shields are the main protection components in Avast Antivirus. The Core Shields are: File Shield, Behavior Shield, Web Shield, and Mail Shield. By default, all Core Shields are enabled to provide optimal protection. Avast Antivirus shields actively analyze suspicious information both sent from and received to your PC, as well as potentially malicious content stored within your PC. These components detect and block malicious files, dangerous websites, unauthorized connections, and other threats.

Enable or Disable all Core Shields

Core Shields are your PC's main defense against malware. All shields are enabled by default for your protection, but all the shields can be instantly disabled for troubleshooting purposes. To disable all Core Shields temporarily:

Open the Avast user interface and go to ☰Menu ▸ Settings.
Select Protection ▸ Core Shields.
Click the slider so that it turns to red (OFF), and select the duration of time Core Shields will be disabled.

All Core Shields are now temporarily disabled. To enable all Core Shields, follow steps 1-2 above, then click the red slider so that it changes to green (ON).

Configure Core Shields sensitivity

In this section of the Core Shields settings, you can determine the sensitivity of the shields. The higher the sensitivity, the higher the protection and potential for false positive malware detections. Reducing the sensitivity reduces the chance of false positive detections, but may also reduce the effectiveness of the Core Shields. Sensitivity is set to Medium sensitivity by default, but can also be set to High sensitivity or Low sensitivity. To change your Core Shields sensitivity:

Click and hold the white marker, then slide it to your desired sensitivity setting.

Configure Core Shields behavior

In this section of the Core Shields settings, select the tab for Virus or Potentially unwanted programs (PUPs), and define the actions to be performed when each type of virus is found on your PC. Configure the following behavior settings:

Actions: select which action Avast applies when a Viruses and Potentially unwanted programs (PUPs) are detected. We recommend selecting Fix automatically.
Enable CyberCapture Technology: define how you want to treat a threat on your PC. You can select Always block a threat to allow Avast to block the threat automatically, or Ask me about decision to receive a notification every time a threat is detected on your PC.
Enable Hardened Mode: uses information based on reputation services to determine which executable files are safe to open.
Enable Rootkit detection: enables Avast to monitor hidden malicious threats in the system. Unticking this option may resolve potential compatibility issues that can cause system crashes.
Enable Exploit detection: enables Avast to detect and block attempts to run malicious threats or processes in the memory from exploiting vulnerable applications on your PC. Unticking this option may result in potential compatibility issues that can cause system crashes.

Enable or disable an individual shield

Open the Avast user interface and go to ☰Menu ▸ Settings.
Select Protection ▸ Core Shields.
Scroll to the Configure shield settings section and ensure the Field Shield tab is selected. Choose your preferred action:
- Untick the box next to Enable File Shield to disable File Shield and select the duration of time File Shield should be disabled.
- Tick the box next to Enable File Shield to enable File Shield.

Open the Avast user interface and go to ☰Menu ▸ Settings.
Select Protection ▸ Core Shields.
Scroll to the Configure shield settings section and click the Behavior Shield tab. Choose your preferred action:
- Untick the box next to Enable Behavior Shield to disable Behavior Shield and select the duration of time Behavior Shield should be disabled.
- Tick the box next to Enable Behavior Shield to enable Behavior Shield.

Open the Avast user interface and go to ☰Menu ▸ Settings.
Select Protection ▸ Core Shields.
Scroll to the Configure shield settings section and click the Web Shield tab. Choose your preferred action:
- Untick the box next to Enable Web Shield to disable Web shield and select the duration of time Web Shield should be disabled.
- Tick the box next to Enable Web Shield to enable Web Shield.

Open the Avast user interface and go to ☰Menu ▸ Settings.
Select Protection ▸ Core Shields.
Scroll to the Configure shield settings section and click the Mail Shield tab:
- Untick the box next to Enable Mail Shield to disable Mail Shield and select the duration of time Web Shield should be disabled.
- Tick the box next to Enable Mail Shield to enable Mail Shield.

You can also enable/disable all Core Shields, Firewall, and Real Site at once from the system tray. Right-click the Avast system tray icon and select Avast shields control, then select an action from the context menu.

We strongly recommend you keep all crucial security components, such as Antivirus shields and Firewall, enabled to ensure your maximum protection. We do not recommend turning off these components indefinitely by selecting the Stop permanently or Disable permanently options.

Configure individual Shield settings

File System Shield actively scans all programs and files on your hard drive as they are opened, run, modified, and saved. If malware is detected, File System Shield prevents the program or file from infecting your PC.

To modify your File Shield settings, open the Avast user interface, go to ☰Menu ▸ Settings ▸ Protection ▸ Core Shields, and scroll to the Configure shield settings section. Select the File System Shield tab. Configure the following settings:

Enable File Shield: turn File Shield on or off.
Scan auto-run items when removable media is attached: specify whether you want File System Shield to scan removable drives for auto-run viruses.
Scan recommended extensions: specify if File Shield should scan all files or only those recommended by Avast.
Scan all files: specify if File Shield should scan all files or only those recommended by Avast
Scan programs when executing: specify whether you want File System Shield to scan programs, scripts, or libraries each time they are run.
Scan files when opening: specify which file types you want File System Shield to scan each time the files are opened.
Scan files when writing: specify the file types you want File System Shield to scan while the files are being created or modified.
Generate report file: specify whether you want File System Shield to produce reports of scan results.

Behavior Shield monitors programs installed on your PC for suspicious behavior that may indicate the presence of malicious code.

To modify your Behavior Shield settings, open the Avast user interface, go to ☰Menu ▸ Settings ▸ Protection ▸ Core Shields, and scroll to the Configure shield settings section. Select the Behavior Shield tab. Configure the following settings:

Enable Behavior Shield: turn Behavior Shield on or off.

Avast For Mac Shields Blocked